• 한국건설관리학회논문집
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• 제16권4호
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• pp.89-97
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• 2015

실시설계도서의 품질은 시공, 그리고 운영 및 관리단계에도 큰 영향을 미친다. 그리고 적절한 실시설계기간의 확보는 실시설계도서의 품질을 위해 중요한 요소이다. 따라서 이 연구는 2009년부터 2014년까지 조달청 맞춤형 서비스를 통해 발주된 총 42개의 건설프로젝트의 실시설계단계의 기간을 분석하였다. 분석에 의하면, 실제 실시설계기간은 계획 실시설계기간보다 1.33배에서 1.79배가 소요되었다. 계획 실시설계기간은 건설교통부 제2000-235호에서 고시하고 있는 방식대로 공사금액에 의해 산정하고 있었지만, 실제 실시설계기간은 공사금액과 아주 낮은 상관관계를 보였다. 이 결과를 토대로 실무자들과 인터뷰를 진행하였고, 공사금액이 실시설계기간과 낮은 상관관계를 보인 것은 이들에게 아주 잘 알려진 사실이었다. 그들은 공사의 복잡도, 설계변경의 정도, 그리고 발주처의 성향에 따라서 실시설계기간이 크게 좌우된다는 점을 언급하였다. 따라서, 실시설계도서의 품질을 향상시키기 위해서는 다양한 요소들을 실시설계기간 산정에 적용하여 적절한 기간을 산정해야하며, 고품질의 실시설계도서는 건설산업에 긍정적 효과를 불러일으킬 것으로 보인다.

• 대한바이러스학회지
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• 제29권1호
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• pp.33-38
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• 1999

Retroviral vector provide a highly efficient method for gene transfer into eukaryotic cells. This vector system can be divided into two components; the retroviral vector itself and the retroviral packaging cell line. The key improvement in the design of these two components are, focused on two aspects; the reduction of helper virus production and high titer-virus. We used PA317 for retrovirus packaging cell line, for its high producibility of viral titer. To test the ability of the vectors to generate high titer-virus, we have chosen four different retroviral vectors; LN, LNSX, LNCX and LXSN. To test easily the viral titer, we have made recombinant construction with CD4 and CD8, checked their viral titer and stained their surface expression. LXSN which contain SV40 early promoter in front of neo gene showed best results in viral transient transfection assay, dot blot assay and surface expression. In addition, recombinant containing CD8 generally showed much higher viral titration and surface expression than CD4.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2001년도 학술대회 논문집
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• pp.163-166
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• 2001

KEPCO has a plan to construct TRF (tritium removal facility) in wolsong nuclear power plant site by 2005. In advance of WTRF construction, the pilot plant was installed at KEPRI in order to show process reliability of WTRF. The main processes of this pilot plant are LPCE(liquid phase catalytic exchange) and CD (cryogenic distillation). Deuterium is separated from heavy water in LPCE process and concentrated in CD process. CD process consists of cold box, where are a distillation column and heat exchangers, vacuum system, cryogenic refrigerant supply system and instrument & control system. The experience of the pilot plant will be used in WTRF design review, operating procedure revision and fundamental education for the operators.

• 한국강구조학회 논문집
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• 제23권5호
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• pp.637-646
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• 2011

본 연구는 철골 구조물의 실시설계 단계에서 활용 가능한 접합부 설계자동화 시스템의 프로토타입 개발에 관한 것으로 보 이음 마찰접합부를 대상으로 한다. 연구에서 접합부 구조설계를 위하여 한국강구조학회에서 발간된 고력볼트 표준접합 설계편람에서 제시하고 있는 표준설계법 및 접합부 표준화 원칙을 검토하고, 수정 보완하였으며, 이를 근간으로 접합부 구조해석 알고리즘을 작성하였다. 작성된 알고리즘을 토대로 접합부 구조설계를 수행하고, 도출된 구조설계 결과로부터 실시설계 단계의 BIM 모델링 소프트웨어에서 접합부 모델을 자동 생성할 수 있는 설계자동화 시스템을 개발하였다. 개발 시스템의 적용성 및 효율성을 검증하기 위하여 개발 시스템으로부터 도출된 접합부 설계 결과(라이브러리 D/B)와 설계편람에서 제시하고 있는 설계 일람표를 비교 검토하였다. 또한 샘플 모델을 대상으로 개발 시스템을 적용하였으며, 접합부 구조설계 결과와 BIM 모델링 소프트웨어와 연동하여 자동 생성된 모델 및 상세도의 속성을 비교 검토하였다.

• 대한전자공학회논문지
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• 제11권6호
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• pp.25-32
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• 1974

먼저 ZnS분말을 공기중에서 소성하는 방법을 연구하여 EL을 제조하여 만들어진 EL의 전기광학적 실험을 하였다. 다음에 CdS를 이용하여 광도전소자를 만들고 그 전기광학적 성질을 조사하였다. 위의 두가지를 이용하여 하나의 미광증폭소자를 만들어 그 원리를 이론적으로 규명하였고 실험적으로 확인하였다. 결론적으로 우리가 세운 이론식이 2%이내의 오차한계에서 정확하였고 미광증폭기의 설계와 제작에 도움이 됨을 알았다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.768-775
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• 2022

Current MEP designs are mostly applied by 2D-based design methods and tend to focus on simple modeling or geometry information expression such as converting 2D-written drawings into 3D modeling without taking advantage of the strength of BIM application. To increase the demand for BIM-based MEP design, geometric information, and property information of each member of the 3D model must be conveniently linked from the phase of the Design Development (DD) to the phase of Construction Document (CD). To conveniently implement a detailed model at each phase, the detailed level of each member of the 3D model must be specific, and an automatic generation of objects at each phase and automatic detailing module for each LOD are required. However, South Korea's guidelines have comprehensive standards for the degree of MEP modeling details for each design phase, and the application of each design phase is ambiguous. Furthermore, in practice, detailed levels of each phase are input manually. Therefore, this paper summarized the detailed standards of MEP modeling for each design phase through interviews with MEP design companies and related literature research. In addition, items that enable auto-detailing with DYNAMO were selected using the checklist for each design phase, and the types of detailed methods were presented. Auto-detailing items considering the detailed level of each phase were classified by members. If a DYNAMO algorithm is produced that automates selected auto-detailing items in this paper, the time and costs required for modeling construction will be reduced, and the demand for MEP design will increase.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1394-1397
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• 1995

In the hazardous areas where explosive gases, vapor or mists exist, electrical apparatus and installations must be of explosion-proof construction to prevent or limit the danger of the ignition of potentially explosive atmosphere. In Korea, nine types of protection have been specified in the government regulations at present: flameproof enclosure, pressurization, oil immersion, increased safety, intrinsic safety, non-incendive, sand filling, encapsulation, and special types. Among these types, the intrinsic safety has the construction which limit or by-pass igniting the electric energy using electronic devices. This type has lots of merits but at the same time requires a high-degree of technology. In this paper, we investigated several dominating factors which affect the minimum ignition energy: this energy plays a very important role in design and evaluation of the intrinsic safety type electrical apparatus. Eletrode material, which is one of the most important factors, was intensively studied for the five sorts of material(Al, Cd, Mg, Sn, and Zn) with performing experiment in a low-voltage inductive circuit using IEC-type spark apparatus. The experimental results show that the minimum ignition energy of electrode material is varied: highest in Cd and lowest in Sn. We also confirmed the effect of eletrode make-and-break speed and magnetic field magnitude.

• 한국안전학회지
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• 제27권3호
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• pp.63-70
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• 2012

In the hazardous areas where explosive gases, vapor or mists exist, electrical apparatus and installations must be the explosion-proof construction to prevent or limit the danger of the ignition of potentially explosive atmosphere. In Korea, nine types of protection have been specified in the government regulations at present: flameproof enclosure, pressurization, oil immersion, increased safety, intrinsic safety, non-incendive, powder filling, encapsulation, and special types. Among these types, the intrinsic safety has the construction which limit or by-pass igniting the electric energy using electronic devices. This type has lots of merits but at the same time requires a high-degree of technology. In this paper, we investigated several dominating factors which affect the minimum ignition energy; this energy plays a very important role in design and evaluation of the intrinsic safety type electrical apparatus. Electrode material, which is one of the most important factors, was intensively studied for the five sorts of material(Al, Cd, Mg, Sn, and Zn) with performing experiment in a low-voltage inductive circuit using IEC-type(International Electro-technical Commission) spark apparatus. The experimental results show that the minimum ignition energy of electrode material is varied: highest in Cd and lowest in Sn. We also confirmed the effect of electrode make-and-break speed.

• 펄프종이기술
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• 제35권5호
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• pp.37-45
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• 2003

To investigate the influence of the design and operating parameters of the headbox on hydrodynamics, a pilot headbox system and pressure monitoring apparatus were constructed. The pilot headbox system consisted of a circulating water reservoir, centrifugal pump, distributor, turbulence generator and slice. The distributor was designed to function as a pressure attenuator. Flow rate to the headbox and MD and CD velocity profiles in the slice zone were monitored using an ultrasonic flowmeter and Pitot tubes, respectively. As the distance from the step diffusor increased, evener CD velocity profile was observed. Wall effect increased with the increase of the velocity. Flow stability in the headbox was evaluated by injecting a dye at the outlet of the distributor. Application of theoretical analysis based on CFD in designing headboxes is briefly discussed.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.381-386
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• 2001

The dust generated from the electric arc furnace steel making process is classified as hazardous material by Korean Environmental Protection Acts, mainly because of the existence of water teachable Pb, Zn and Cd. Thus the treatment of EAF dust is being carried out to fulfill both the environmental aspect and recovery of valuable metals. To establish the proper process for recovering the valuable metals (Fe, Zn, Pb and Cd) and producing the non-toxic slag from EAF dust, using RAPID-10 system, feasibility study have been carried out. To find out the scale-up factor for designing the commercial scale EAF dust treatment process(capacity 50,000 ton EAF dust per year) entitled RAPID-50 system. The design and construction of RAPID-50 (RIST Arc Plasma Industrial Device) system for treating 50,000 ton of EAF dust per year is now undergoing. Overall plan for treating EAF dust generated in KOREA will be setup after successful operation (December, 2002) of RAPID-50 system.